Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
llythyren
←
Welsh
llythyr
(affix)
←
Welsh
-en
(affix)
→
Breton
lizherenn
(cognate)
→
Welsh
llythyrennau
(affix)
→
Welsh
priflythyren
(affix)
→
Welsh
llythrennedd
(affix)
→
Welsh
llythrennau
(affix)
→
Welsh
llythrennog
(affix)
→
Welsh
llythrennol
(affix)
→
Welsh
llythrennu
(affix)